/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.metrics.metricsets.jvm;

import org.apache.iotdb.metrics.AbstractMetricService;
import org.apache.iotdb.metrics.metricsets.IMetricSet;
import org.apache.iotdb.metrics.utils.MetricLevel;
import org.apache.iotdb.metrics.utils.MetricType;

import java.lang.management.*;

/**
 * This file is modified from io.micrometer.core.instrument.binder.jvm.JvmMemoryMetrics
 */
public class JvmMemoryMetrics implements IMetricSet {
    @Override
    public void bindTo(AbstractMetricService metricService) {
        for (BufferPoolMXBean bufferPoolBean :
                ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class)) {
            metricService.createAutoGauge(
                    "jvm_buffer_count_buffers",
                    MetricLevel.IMPORTANT,
                    bufferPoolBean,
                    BufferPoolMXBean::getCount,
                    "id",
                    bufferPoolBean.getName());

            metricService.createAutoGauge(
                    "jvm_buffer_memory_used_bytes",
                    MetricLevel.IMPORTANT,
                    bufferPoolBean,
                    BufferPoolMXBean::getMemoryUsed,
                    "id",
                    bufferPoolBean.getName());

            metricService.createAutoGauge(
                    "jvm_buffer_total_capacity_bytes",
                    MetricLevel.IMPORTANT,
                    bufferPoolBean,
                    BufferPoolMXBean::getTotalCapacity,
                    "id",
                    bufferPoolBean.getName());
        }

        for (MemoryPoolMXBean memoryPoolBean :
                ManagementFactory.getPlatformMXBeans(MemoryPoolMXBean.class)) {
            String area = MemoryType.HEAP.equals(memoryPoolBean.getType()) ? "heap" : "nonheap";

            metricService.createAutoGauge(
                    "jvm_memory_used_bytes",
                    MetricLevel.IMPORTANT,
                    memoryPoolBean,
                    (mem) -> (long) JvmUtils.getUsageValue(mem, MemoryUsage::getUsed),
                    "id",
                    memoryPoolBean.getName(),
                    "area",
                    area);

            metricService.createAutoGauge(
                    "jvm_memory_committed_bytes",
                    MetricLevel.IMPORTANT,
                    memoryPoolBean,
                    (mem) -> (long) JvmUtils.getUsageValue(mem, MemoryUsage::getCommitted),
                    "id",
                    memoryPoolBean.getName(),
                    "area",
                    area);

            metricService.createAutoGauge(
                    "jvm_memory_max_bytes",
                    MetricLevel.IMPORTANT,
                    memoryPoolBean,
                    (mem) -> (long) JvmUtils.getUsageValue(mem, MemoryUsage::getMax),
                    "id",
                    memoryPoolBean.getName(),
                    "area",
                    area);
        }
    }

    @Override
    public void unbindFrom(AbstractMetricService metricService) {
        for (BufferPoolMXBean bufferPoolBean :
                ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class)) {
            metricService.remove(
                    MetricType.AUTO_GAUGE, "jvm_buffer_count_buffers", "id", bufferPoolBean.getName());

            metricService.remove(
                    MetricType.AUTO_GAUGE, "jvm_buffer_memory_used_bytes", "id", bufferPoolBean.getName());

            metricService.remove(
                    MetricType.AUTO_GAUGE, "jvm_buffer_total_capacity_bytes", "id", bufferPoolBean.getName());
        }

        for (MemoryPoolMXBean memoryPoolBean :
                ManagementFactory.getPlatformMXBeans(MemoryPoolMXBean.class)) {
            String area = MemoryType.HEAP.equals(memoryPoolBean.getType()) ? "heap" : "nonheap";

            metricService.remove(
                    MetricType.AUTO_GAUGE,
                    "jvm_memory_used_bytes",
                    "id",
                    memoryPoolBean.getName(),
                    "area",
                    area);

            metricService.remove(
                    MetricType.AUTO_GAUGE,
                    "jvm_memory_committed_bytes",
                    "id",
                    memoryPoolBean.getName(),
                    "area",
                    area);

            metricService.remove(
                    MetricType.AUTO_GAUGE,
                    "jvm_memory_max_bytes",
                    "id",
                    memoryPoolBean.getName(),
                    "area",
                    area);
        }
    }
}
